Comparison Bailong Police BL-1837-T6 vs Bailong Police BL-1831-T6

The maximum range at which the flashlight provides any effective illumination of objects. Different manufacturers have different criteria for this efficiency when measuring ranges, and therefore it is only possible to unequivocally compare among themselves in range only models of one manufacturer. At the same time, this parameter allows us to compare models from different manufacturers with some certainty: for example, flashlights with a lighting range of 15 m and 100 m will clearly belong to different range classes, regardless of manufacturers.

Note that the range of illumination depends not only on the maximum luminous flux provided by the lantern (see above), but also on the features of its design: the narrower the beam is provided by the reflector of the lantern, the greater the range will be, and vice versa — scattered light does not spread far. Some models allow you to adjust the beam width depending on the requirements of the situation (for more details, see "Adjusting the focus").

It is also worth bearing in mind that models with the same claimed lighting range can cover different spaces. For example, a hand lamp (see Type) with a reflector diameter of 20 cm will be able to provide a wider beam than a conventional hand lamp with a 5 cm reflector. And although in both cases the objects that fall into the light spot will be illuminated in the same way, however, in the first case, the size of the spot itself will be larger, and the actual efficien...cy of the flashlight will be correspondingly higher (in light of the fact that it is easier to "feel" individual objects with a wide beam, especially at a considerable distance).

The number and types of additional modes of operation provided for in the flashlight.

Additional modes include all modes in which the flashlight operation format differs from the standard “constant luminous flux in the visible range without pronounced coloration”. Namely strobe, SOS, beacon, flicker, light, low / high beam, infrared (IR), ultraviolet (UV), red light, blue light, green light, etc. More details about each:

- Stroboscope. Fast flashing mode - several flashes per second. One of the most popular applications of this function is disorientation of the enemy in an extreme situation; in light of this, a stroboscope is often provided in underbarrel flashlights (see "Type"), as well as manual models of "tactical" specialization. In addition, fast blinking is well suited to distinguish yourself on the road - especially in cloudy weather or at night: such a light is much more visible than constant light, including with peripheral vision. At the same time, we note that when using a stroboscope, some caution should be observed: due to the specific effect on the p...syche, this mode can provoke exacerbations of certain diseases - for example, seizures in patients with epilepsy.

— S.O.S. The mode of operation is "three short flashes - three long - three short", which corresponds to the international signal "please help" (letters SOS in Morse code format). This eliminates the need to send such a signal manually and allows you to leave the flashlight to work autonomously, and take care of more pressing problems (which often accompany situations that require the "SOS").

— Low / high beam. Possibility to switch between far directional beam and near diffused light. This switching is most often accomplished by using multiple sets of LEDs; at the same time, in some models, each of these sets is responsible for its own mode, in others, all diodes work in the high beam, and only a part of them work in the low beam.

— Infrared (IR). Illumination in the invisible infrared range. It is used, in particular, to improve the efficiency of night vision devices and IR sights. Note that many of the LEDs responsible for this mode also glow in the visible range (red light) during operation; however, this glow is quite weak and, as a rule, is noticeable to the human eye only when looking directly at its source from a short distance.

- Ultraviolet (UV). Illumination in the ultraviolet range is mainly used to identify objects and traces that are invisible under normal lighting. One of the most popular ways to use this feature is with a makeshift currency detector: most modern banknotes have markings that glow under UV light. Also, such light can be used to detect inscriptions with “invisible” ink (including marks on the same banknotes), some biological (for example, blood) and chemical liquids (in particular, UV-sensitive compounds can detect leaks in pipes and liquid contours), etc. Note that the UV emitter usually glows in the visible range - with a characteristic bluish tint; this allows you to accurately determine whether such a light is on or off.

- Red light. One of the more popular complementary colors in modern flashlights; can be used both in combination with blue and green (in the so-called RGB models), and as the only auxiliary shade. One of the features of red light is that it practically does not affect night vision, does not penetrate through the eyelids, and even after complete darkness does not blind the eyes. This makes such lighting the best option, for example, for clarifying map data during a night hike, when you need to quickly restore vision after turning off the light, or for emergency lighting in a sleeping room, where you need to see the environment and at the same time it is undesirable to disturb sleeping people with the light. . Another way to use red light is signaling: this light travels farther than blue or green, and stands out prominently against most landscapes and man-made objects. Hue change can be carried out both due to the light filter on the main light source, and due to a separate LED.

- Blue light. One of the shades used in the main three-color "RGB-lanterns" - along with red (see above) and green. This light is intended mainly for situations where you need to effectively illuminate the space in front of you, but it is undesirable to use ordinary white light. Human vision is most sensitive just to blue and green shades; therefore, a relatively weak blue light flux allows a large amount of detail to be revealed. And in some situations, such lighting can be even more effective than white. For example, if at night a white lantern is pointed at a light object, then the space behind this object will be hardly noticeable due to the bright reflected light; and a weak blue light will evenly highlight both the "foreground" and the "background". But using this shade at high brightness, on the contrary, is undesirable - reflection from bright blue light will dazzle even more than from white, and even more so red. And if a blue beam, even a weak one, hits directly into the eyes, it will instantly knock out night vision, and it will take quite a long time to restore it.
Note that the choice between blue and the similar green (see below) depends on the specific situation: different shades may be optimal in different situations.

- Green light. Hue, most commonly used in tri-color RGB lights, but sometimes used as the only complementary color. In many ways it is similar to the blue described above - in particular, in some situations, a weak green light can clearly reveal details that are invisible in other shades (even under the same blue light), but high brightness is undesirable for such a beam. In addition, this color has its own specific feature: many animals almost do not react to green light, so it is especially convenient for hunting.

- Lighthouse. The mode of infrequent flashes with a repeating amplitude, most often at a relatively low brightness (with some exceptions to the rule). In some models of lanterns, you can even meet more than one version of the lighthouse. The mode is designed to detect and observe the user at a distance; at the same time, the beacon not only consumes battery power more economically than a constant light of the same brightness, but is also better visible from afar. We also note that in headlamps, the flicker mode performs a similar function (see below).

- Flicker. In this mode, the flashlight emits short pulses or shines with a variable, "pulsating" brightness. This format of work is not intended to illuminate the surrounding area, but to make the user more visible to others: a person reacts to flickering light reflexively, even if its source is far in the peripheral vision zone. The flicker mode will be useful primarily on the roads - for example, when walking or cycling at night: in the same city, such a warning for surrounding drivers will not be out of place, and there is no need to talk about dark country roads.

— Red blinking (red blinking, red beacon). This mode allows you to make the flashlight as noticeable as possible: the red light, especially the flashing one, catches the eye even in the daytime. And in the dark, this shade is also useful due to the fact that it does not harm night vision (for more on this, see "Red Light" above). But the specific specialization of the red flashing may be different, depending on the specialization of the flashlight. For example, in tourist models (see "Type"), this mode allows you to give a signal, indicate the location of the camp, collection points, etc.; and in headbands, it is used to highlight the user on the road and make him as visible as possible to others (primarily for car drivers).

- Lamp. The function is found, as a rule, among hand lamps and in tourist models of flashlights (as an addition to the main directional light). In fact, we are talking about a scattered light mode - as opposed to a directional beam that provides the main light source with a reflector. Diffused light does not differ in range, but it allows you to cover a significant space - for example, to illuminate an entire room.

- LCU. Laser pointer mode: the flashlight emits a laser beam, the mark from which points to the intended point of impact. It makes sense to provide for such a regime only in underbarrel models (see "Type").

Note that this list is not exhaustive: modern flashlights may provide for other, more specific modes of operation. In such cases, the features of the functionality should be clarified according to the manufacturer's documentation.

The type of batteries used in the flashlight.

The most popular nowadays are replaceable cells in sizes AA, AAA, C, D and CR123, replaceable lithium-ion 18650 batteries, as well as branded batteries. At the same time, some models from the latter category are designed for standard batteries for power tools and are supplied without their own power sources at all; such devices are commonly referred to as the so-called building lights. And here is a more detailed description of the different types of food:

— AA. Batteries, colloquially known as "finger-type" batteries. One of the most common sizes nowadays; such cells are available both as disposable batteries and as rechargeable batteries, and they are sold almost everywhere. On the other hand, in modern flashlights this option is less common than the more miniature AAA — the development and reduction in the cost of LEDs has made it possible to effectively use more compact power supplies.
Note that "finger" batteries can vary markedly in capacity; accordingly, the battery life of a flashlight with such a power supply will be different — depending on the brand of batteries (accumulators) used. Also note that the use of such cells (like most replacement batteries) is inevitably associate...d with additional expenses: you will either have to regularly buy fresh disposable cells, or spend money on a set of batteries with a charger.

— AAA. They are also "little finger" batteries — by analogy with the "finger" ones described above. They are also available in different formats — both batteries and accumulators — and in different capacities and prices. They are smaller than AA, which is why they are generally inferior to them in terms of capacity. On the other hand, modern LEDs often have enough of such power; and compactness is often more important than high capacity. Therefore, AAA elements in modern flashlights are much more common than AA.

— C. 1.5-volt cylindrical batteries with dimensions of 50x26.2 mm; approximately equal in length to AA, but much thicker, due to which they have a much higher capacity. Some time ago they were quite popular, but now they are used extremely rarely — mainly in devices where the dimensions of the case initially allow the installation of such power sources (a typical example is batons, see "Type").

— D. Cylindrical batteries, the largest (61.5x34.2 mm), capacious and powerful among the currently used 1.5-volt power supplies. Similar to the elements of type C described above, they are rarely used, mainly in lanterns that initially assume large sizes.

— CR123. Cylindrical batteries. They have a length of 34.5 mm and a diameter of 17 mm, due to which they resemble a smaller variation of type C, but differ in operating voltage — 3 V. In the battery version, they are marked as CR123A. In general, they are quite rare, mainly in hand-held compact models and key chains, as well as underbarrel flashlights for pistols (see "Type"); however, specifically among these categories, such batteries are quite popular.

— 18650. In general, nowadays, a whole family of batteries is produced that use a 5-digit marking — for example, 14500 and 17650. All of them are made using lithium-ion technology, and have a cylindrical shape and a voltage of 3.7 V; the marking indicates the dimensions of such batteries in diameter and length (see below for more details). Specifically, 18650 (diameter 18 mm, length 65 mm) is the most popular type of such elements — both in general and specifically among flashlights. This is primarily due to the combination of compact dimensions and fairly solid performance. At the same time, thanks to cheaper technologies, 18650 batteries can now be used even in low-cost models — including those initially supplied in the kit. However, anyway, it would not hurt to clarify the complete set of a flashlight with such a power supply separately — and this applies to both the battery and the options for charging it available “out of the box” (for more details, see “Packaging”).
In general, such elements combine the advantages of replaceable batteries and branded batteries. On the one hand, the power source is reusable; when the charge is exhausted, you do not need to spend money on fresh batteries every time; on the other hand, if desired, you can purchase several batteries and quickly change them as needed. And with a separate charger, you can completely reduce work interruptions to zero: while one set of batteries is in use, the rest can be charged.

— Accumulator. This option means that the flashlight uses a branded battery that does not belong to standard sizes (and in many models it is also non-removable). One of the advantages of such a power supply is that the user does not need to spend additional time and money on buying batteries: the power supply is initially supplied in the kit, and when the energy is depleted, it is enough to charge it. At the same time, the delivery set may include both an adapter for an outlet and a car charger (for more details, see "Packaging"). The second advantage is that branded batteries are often more compact and at the same time more capacious than replacement batteries; and in general, such a battery is easier to fit into the design of a flashlight (especially non-standard). Among the key disadvantages of this option, first of all, the impossibility of a quick replacement can be noted — usually, a dead battery needs to be charged, which takes time and a power source. In addition, having your own battery inevitably affects the cost; this is especially noticeable when comparing low-cost models of rechargeable flashlights with battery-powered counterparts. However, the difference in price can quickly pay off with intensive use.
A special case is the so-called "construction" rechargeable lights. They are produced mainly by large manufacturers of power tools (Bosch, DeWalt, Makita, etc.) and use replaceable batteries for tools of the “native” brand as power sources. At the same time, such a battery is usually not included in the kit — it is assumed that it is more convenient for the user to buy a battery on their own, at their discretion (or that the household already has a branded tool and, accordingly, a power source).

In addition, more rare and specific food options can be found in flashlights:

— AAAA. Batteries are even smaller than the "little finger" AAA — 43 mm in length and 8.3 mm in diameter. They are used in some thin compact format lanterns, many of these models resemble fountain pens in shape and size.

— Replaceable Li-Ion batteries with a 5-digit digital marking — similar to the 18650 described above, but differing in size. Specifically, among the flashlights you can find the following form factors of similar power supplies: 10180, 10440, 14430, 14500, 16340, 17650, 21700, 26650, 32650. All of them have a standard voltage of 3.7 V, and the size of the element can be determined by marking: the first two digits correspond to its diameter, the second two to its length (both in millimetres). The larger the battery, the higher its capacity and, accordingly, the power supply.
Separately, it is worth noting that the 14500 cells are identical in size to conventional AAA finger batteries, but differ from them in operating voltage. In some flashlights this difference is taken into account, and they can use both types of power sources (with less battery life and/or brightness when running on batteries). However, in general, the possibility of such a replacement needs to be clarified in each case.

— Series CR****. Batteries — "coins" of a characteristic disk-shaped form based on lithium technology (not to be confused with lithium-ion batteries — in this case we are talking about disposable power supplies). The numbers in the marking indicate a specific size — for example, the CR2032 marking corresponds to 20 mm in diameter and 3.2 mm in thickness. Actually, CR2032 is one of the most popular sizes of such batteries; besides him, you can find CR1220, CR1616, CR2016 and CR2032 in flashlights. All such power sources are mainly used in compact low-power flashlights, in particular, key fobs (see "Type").

— Series AG**. The "AG" suffix with a number (one or two) is used to refer to miniature alkaline manganese type disposable batteries manufactured by Seiko and some other brands. The larger the number in the designation, the larger the size of the battery: the smallest of these elements, AG0, have a diameter of 5.8 mm and a thickness of just over 2 mm, and the largest (of those used in flashlights), AG13, are 11.6 mm in diameter and 5.4 mm thick. The main scope of such elements is miniature flashlights, including key chains.

— Series LR**. In fact, it is a complete analogue of the AG series described above **; the only difference is that AG is a brand name, while LR is used as a common international designation. In addition, there is no clear relationship in this standard between the number in the designation and the actual dimensions of the battery: for example, LR41 is larger than LR58, and LR44 is larger than both of them. Actually, in modern flashlights there are mainly just LR41 and LR44; they are analogues of AG3 and AG13, respectively, and have dimensions (length / diameter) of 7.9x3.6 mm in the first case and 11.6x5.4 mm in the second.

— 3R12. Batteries with a voltage of 4.5 V in a case of a characteristic shape: almost square and flat (70x60x22 mm), with rounded corners and two contact plates in the upper part. They were originally created as batteries for flashlights, but nowadays they are used quite rarely due to their large dimensions, shape features and relatively small capacity.

— PX28L. Compact and at the same time quite powerful cylindrical batteries with a nominal voltage of 6.2 V. They are well suited for working with a powerful load, including bright LEDs, but in general they are not widely used, and therefore they are rarely used in flashlights.

— R20. Another name for replaceable cells in size D is, more precisely, for disposable salt batteries produced in this size (other designations are used for other varieties). Usually, flashlights under R20 are compatible with any type D elements, however, the ability to work with salt batteries (having a lower capacity than alkaline counterparts, and even more so batteries) indicates a good energy efficiency and economy of the flashlight.

— CR2. Relatively small batteries (length — 26.7 mm, diameter — 15.1 mm), originally created for compact "soap" cameras — in the expectation that one such element could replace 2 AA batteries. The designation CR2 is commonly used for disposable batteries, batteries of this size are usually referred to as 15270.

— From the cigarette lighter. Power from the car on-board network through the cigarette lighter (or an auto socket of a similar format) can be found in two types of lamps. The first is hand lamps and auxiliary lighting (see "Type") designed for use with or near the vehicle. Most of these devices only work when connected to the cigarette lighter, and a fairly long (several metres) wire with an appropriate plug is responsible for the connection itself. The second option is miniature models (manual compact type and key rings) of “automotive” specialization. Such devices are equipped with their own batteries and are able to work autonomously, and the cigarette lighter is used to charge the battery — and the flashlight body itself plays the role of a plug (in other words, to charge, just insert the device into the cigarette lighter socket). However, both varieties are rare nowadays: in the case of lamps, the wire significantly limits mobility, and in the case of small flashlights, charging from the car network is not so often required. And even in the latter case, a more practical, versatile and convenient option may be a traditional rechargeable flashlight, supplemented by a car charger (see "Complete set").

This feature is indicated for flashlights whose housings have an increased degree of dust and moisture protection. The degree of such protection may vary: for example, some models can easily withstand heavy rain, others “survive” being caught in a sea wave, and the most advanced ones can even be used when diving with scuba diving (see “Type - For diving ”). The features of protection should be clarified in each case separately; however, if you need a flashlight that can withstand adverse conditions, you should definitely look for it among the models that explicitly state dust and moisture protection. Such models will be useful primarily for those who often have to work in difficult environments: climbers and other “extreme” tourists, rescuers, military personnel, sailors, etc.

The level of protection is indicated by two numbers according to the IP standard ( IP65, IP66, IP67...). The first number corresponds to dust protection (maximum 6). The second number indicates the degree of protection from water; here in protected models, level 7 (the ability to immerse under water to a depth of 1 m for half an hour) or 8 (the ability to work for long periods of time under water at a depth of more than 1 m) is usually found. Thus, the maximum degree of protection according to this standard is IP68, completely sealed. There is also a marking like IPX8, where the first digit is not indicated - this only means that the flashlight has not been officially certified for dust resistance. In the above example, this is not necessary - water resistance 8 automatically means a sealed case, impenetrable to dust.

It is worth considering that even completely sealed models may have different restrictions on the maximum immersion depth. So if you are going to intensively use the flashlight underwater, you should make sure that it can withstand diving to the planned depth.